Significantly Reduced Blood Pressure Measurement Variability for Both Normotensive and Hypertensive Subjects: Effect of Polynomial Curve Fitting of Oscillometric Pulses

Figure 4

Within-subject variabilities (SD of three repeat measurements in mmHg) of SBP, MAP, and DBP measured from different techniques for both the normotensive (a) and hypertensive (b) groups. In each subfigure, the far left side is from the manual auscultatory technique and the two right ones are from the automatic oscillometric techniques, respectively, without and with polynomial curve fitting. The measurement variability of each individual subject is plotted, together with the mean ± SD of variability from all subjects in that group.

(a)

(b)